:root {
  --primary-color: #2563eb;
  --secondary-color: #1e40af;
  --accent-color: #3b82f6;
  --success-color: #10b981;
  --warning-color: #f59e0b;
  --danger-color: #ef4444;
  --text-primary: #1f2937;
  --text-secondary: #6b7280;
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-card: #ffffff;
  --border-color: #e5e7eb;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-success: linear-gradient(135deg, #10b981 0%, #059669 100%);
  --gradient-warning: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-secondary);
  overflow-x: hidden;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header Styles */
.header {
  background: var(--gradient-primary);
  color: white;
  padding: 60px 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="0.5"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>') repeat;
  opacity: 0.3;
}

.header-content {
  position: relative;
  z-index: 1;
}

.header h1 {
  font-size: 3.5rem;
  font-weight: 800;
  margin-bottom: 20px;
  text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.header .subtitle {
  font-size: 1.5rem;
  font-weight: 300;
  opacity: 0.9;
  margin-bottom: 30px;
}

.header .highlight {
  background: rgba(255,255,255,0.2);
  padding: 15px 30px;
  border-radius: 50px;
  display: inline-block;
  font-size: 1.2rem;
  font-weight: 600;
  backdrop-filter: blur(10px);
}

/* Navigation */
.nav {
  background: var(--bg-card);
  box-shadow: var(--shadow-md);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-container {
  display: flex;
  justify-content: center;
  padding: 0;
}

.nav-list {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-item {
  margin: 0;
}

.nav-link {
  display: block;
  padding: 20px 30px;
  text-decoration: none;
  color: var(--text-secondary);
  font-weight: 500;
  transition: all 0.3s ease;
  border-bottom: 3px solid transparent;
}

.nav-link:hover,
.nav-link.active {
  color: var(--primary-color);
  border-bottom-color: var(--primary-color);
  background: rgba(37, 99, 235, 0.05);
}

/* Main Content */
.main {
  padding: 60px 0;
}

.section {
  margin-bottom: 80px;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 20px;
  text-align: center;
  position: relative;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 4px;
  background: var(--gradient-primary);
  border-radius: 2px;
}

.section-description {
  font-size: 1.2rem;
  color: var(--text-secondary);
  text-align: center;
  margin-bottom: 50px;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

/* Cards */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 30px;
  margin-bottom: 40px;
}

.card {
  background: var(--bg-card);
  border-radius: 16px;
  padding: 30px;
  box-shadow: var(--shadow-lg);
  transition: all 0.3s ease;
  border: 1px solid var(--border-color);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-primary);
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
}

.card-header {
  display: flex;
  align-items: center;
  margin-bottom: 20px;
}

.card-icon {
  width: 50px;
  height: 50px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-right: 15px;
  font-size: 24px;
  color: white;
}

.card-icon.research { background: var(--gradient-primary); }
.card-icon.blueprint { background: var(--gradient-success); }
.card-icon.report { background: var(--gradient-warning); }
.card-icon.prd { background: linear-gradient(135deg, #8b5cf6 0%, #7c3aed 100%); }
.card-icon.demo { background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%); }

.card-title {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0;
}

.card-content {
  color: var(--text-secondary);
  line-height: 1.7;
}

.card-stats {
  display: flex;
  justify-content: space-between;
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid var(--border-color);
}

.stat {
  text-align: center;
}

.stat-number {
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary-color);
  display: block;
}

.stat-label {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-top: 5px;
}

/* Progress Bars */
.progress-container {
  margin: 40px 0;
}

.progress-item {
  margin-bottom: 25px;
}

.progress-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}

.progress-title {
  font-weight: 600;
  color: var(--text-primary);
}

.progress-percentage {
  font-weight: 700;
  color: var(--primary-color);
}

.progress-bar {
  height: 12px;
  background: var(--border-color);
  border-radius: 6px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  border-radius: 6px;
  transition: width 0.8s ease;
}

.progress-fill.high { background: var(--gradient-success); }
.progress-fill.medium { background: var(--gradient-warning); }
.progress-fill.low { background: var(--gradient-primary); }

/* Timeline */
.timeline {
  position: relative;
  padding: 20px 0;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--gradient-primary);
  transform: translateX(-50%);
}

.timeline-item {
  display: flex;
  margin-bottom: 40px;
  position: relative;
}

.timeline-item:nth-child(even) {
  flex-direction: row-reverse;
}

.timeline-content {
  flex: 1;
  max-width: 45%;
  background: var(--bg-card);
  padding: 25px;
  border-radius: 12px;
  box-shadow: var(--shadow-md);
  position: relative;
}

.timeline-item:nth-child(odd) .timeline-content {
  margin-right: 60px;
}

.timeline-item:nth-child(even) .timeline-content {
  margin-left: 60px;
}

.timeline-content::before {
  content: '';
  position: absolute;
  top: 20px;
  width: 0;
  height: 0;
  border: 10px solid transparent;
}

.timeline-item:nth-child(odd) .timeline-content::before {
  right: -20px;
  border-left-color: var(--bg-card);
}

.timeline-item:nth-child(even) .timeline-content::before {
  left: -20px;
  border-right-color: var(--bg-card);
}

.timeline-marker {
  position: absolute;
  left: 50%;
  top: 20px;
  width: 20px;
  height: 20px;
  background: var(--primary-color);
  border: 4px solid white;
  border-radius: 50%;
  transform: translateX(-50%);
  box-shadow: var(--shadow-md);
}

.timeline-date {
  font-size: 0.9rem;
  color: var(--primary-color);
  font-weight: 600;
  margin-bottom: 10px;
}

.timeline-title {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 10px;
}

.timeline-description {
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Value Proposition */
.value-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
  margin: 40px 0;
}

.value-card {
  background: var(--bg-card);
  padding: 40px 30px;
  border-radius: 16px;
  text-align: center;
  box-shadow: var(--shadow-lg);
  transition: all 0.3s ease;
  border: 1px solid var(--border-color);
}

.value-card:hover {
  transform: translateY(-5px);
}

.value-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto 20px;
  border-radius: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 36px;
  color: white;
  background: var(--gradient-primary);
}

.value-title {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 15px;
}

.value-description {
  color: var(--text-secondary);
  line-height: 1.6;
}

.value-number {
  font-size: 3rem;
  font-weight: 800;
  color: var(--primary-color);
  margin-bottom: 10px;
}

/* Footer */
.footer {
  background: var(--text-primary);
  color: white;
  padding: 40px 0;
  text-align: center;
}

.footer-content {
  max-width: 800px;
  margin: 0 auto;
}

.footer h3 {
  font-size: 1.8rem;
  margin-bottom: 20px;
}

.footer p {
  font-size: 1.1rem;
  opacity: 0.9;
  line-height: 1.6;
}

/* Responsive Design */
@media (max-width: 768px) {
  .header h1 {
    font-size: 2.5rem;
  }
  
  .header .subtitle {
    font-size: 1.2rem;
  }
  
  .nav-list {
    flex-direction: column;
  }
  
  .nav-link {
    padding: 15px 20px;
    text-align: center;
  }
  
  .cards-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  
  .timeline::before {
    left: 20px;
  }
  
  .timeline-item {
    flex-direction: column !important;
  }
  
  .timeline-content {
    max-width: 100%;
    margin-left: 50px !important;
    margin-right: 0 !important;
  }
  
  .timeline-content::before {
    left: -20px !important;
    border-right-color: var(--bg-card) !important;
    border-left-color: transparent !important;
  }
  
  .timeline-marker {
    left: 20px;
    transform: translateX(-50%);
  }
  
  .value-grid {
    grid-template-columns: 1fr;
  }
  
  .section-title {
    font-size: 2rem;
  }
}

/* Status Tags */
.status-tag {
    position: absolute;
    top: 15px;
    right: 15px;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 0.75em;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    z-index: 10;
}

.status-completed {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.status-in-progress {
    background-color: #cce7ff;
    color: #004085;
    border: 1px solid #b3d9ff;
}

.status-pending {
    background-color: #fff3cd;
    color: #856404;
    border: 1px solid #ffeaa7;
}

/* Card positioning for status tags */
.card {
    position: relative;
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
  animation: fadeInUp 0.6s ease-out;
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.slide-in-left {
  animation: slideInLeft 0.6s ease-out;
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.slide-in-right {
  animation: slideInRight 0.6s ease-out;
}

/* Utility Classes */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.mb-20 { margin-bottom: 20px; }
.mb-30 { margin-bottom: 30px; }
.mb-40 { margin-bottom: 40px; }
.mt-20 { margin-top: 20px; }
.mt-30 { margin-top: 30px; }
.mt-40 { margin-top: 40px; }

.mb-30 {
    margin-bottom: 30px;
}

.mb-40 {
    margin-bottom: 40px;
}

.highlight-box {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-left: 4px solid var(--primary-color);
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.highlight-box h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
    font-size: 1.1em;
}

.highlight-box ul {
    margin: 0;
    padding-left: 20px;
}

.highlight-box li {
    margin-bottom: 8px;
    line-height: 1.6;
}

.highlight-box p {
    margin-bottom: 10px;
    line-height: 1.6;
}

.highlight-text {
  color: var(--primary-color);
  font-weight: 600;
}

.success-text {
  color: var(--success-color);
  font-weight: 600;
}

.warning-text {
  color: var(--warning-color);
  font-weight: 600;
}

.large-text {
  font-size: 1.2rem;
}

.small-text {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* 数字渐变效果 */
.md-highlight-number {
  font-weight: bold;
  background: linear-gradient(220.55deg, #9F25FF 0%, #FF7A00 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}